As a significant representative of traditional energy sources, petroleum energy has been supporting the industrialization of the entire nation. In the context of modernization, it is urgently in need of green, efficient and safe development and iteration. The low-field nuclear magnetic resonance technology provided by Niumag plays a crucial role in the field of petroleum energy, especially in applications such as physical property analysis of oil and gas reservoirs (porosity, pore size distribution, oil and water saturation, permeability, stratification), development evaluation of oil and gas reservoirs (displacement, fracturing, imbibition, enhanced oil recovery), and unconventional energy sources (shale gas, coalbed methane, natural gas, CCS, CCUS, etc.), providing strong support and facilitating exploration and development in the petroleum energy sector.